I have an awesome little machine that one of my MFP friends helped me get at a great price called Mr. Coffee Cafe Latte. I put my almond milk, sugar free coffee syrup and protein in the bottom portion of the machine and the machine steams and froths the almond milk while the coffee brews into it. The protein blends in very nicely. I've been using it daily since I got it and it's saved me a lot on coffee!
I also discovered a while back that Starbucks has protein that you can blend into your coffee. I don't get cold, blended drinks anymore because of the sugar but you can add protein to those. Instead, I ask them to steam the protein into hot coffee when I get it and it turns out smooth and creamy. If they don't steam it in, it will be a nasty, clumpy mess but if they steam it in it's wonderful! I usually get 2 scoops of protein (each scoop has 15 g of protein and only 30 calories per scoop) in a sugar free soy vanilla latte.